Binding element



FIG. 1 is a perspective view of a binding element showing my new design;

FIG. 2 is a front view thereof, the rear view being symmetric to the front view;

FIG. 3 is a right view thereof, the left side being symmetric to the right side;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

CLAIM The ornamental design for a binding element, as shown and described. 